Die Nationalökonomie entstand als eine natürliche Folge der Ausdehnung des Handels, und mit ihr trat an die Stelle des einfachen, unwissenschaftliche… - Friedrich Engels

It makes unavoidably necessary an entirely new organization of society in which production is no longer directed by mutually competing individual industrialists but rather by the whole society operating according to a definite plan and taking account of the needs of all.

With this as its basic constitution, civilization achieved things of which gentile society was not even remotely capable. But it achieved them by setting in motion the lowest instincts and passions in man and developing them at the expense of all his other abilities. From its first day to this, sheer greed was the driving spirit of civilization; wealth and again wealth and once more wealth, wealth, not of society, but of the single scurvy individual–here was its one and final aim. If at the same time the progressive development of science and a repeated flowering of supreme art dropped into its lap, it was only because without them modern wealth could not have completely realized its achievements.

Labour is the source of all wealth, the political economists assert. And it really is the source -- next to nature, which supplies it with the material that it converts into wealth. But it is even infinitely more than this. It is the prime basic condition for all human existence, and this to such an extent that, in a sense, we have to say that labour created man himself.